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Summary: Inherited Fields | Ctors | Methods | Inherited Methods

# PreferenceChangeEvent

`public class PreferenceChangeEvent`
`` `extends EventObject` ``

java.lang.Object
↳ | java.util.EventObject
| ↳ | java.util.prefs.PreferenceChangeEvent

An event emitted by a `Preferences` node to indicate that a preference has been added, removed or has had its value changed.

Note, that although PreferenceChangeEvent inherits Serializable interface from EventObject, it is not intended to be Serializable. Appropriate serialization methods are implemented to throw NotSerializableException.

See also:

- `Preferences`
- `PreferenceChangeListener`
- `NodeChangeEvent`

## Summary

### Inherited fields
From class `java.util.EventObject`
`protected Object` | `source` The object on which the Event initially occurred.

### Public constructors
`PreferenceChangeEvent(Preferences node, String key, String newValue)` Constructs a new `PreferenceChangeEvent` instance.

### Public methods
`String` | `getKey()` Returns the key of the preference that was changed.
`String` | `getNewValue()` Returns the new value for the preference.
`Preferences` | `getNode()` Returns the preference node that emitted the event.

### Inherited methods
From class `java.util.EventObject`
`Object` | `getSource()` The object on which the Event initially occurred.
`String` | `toString()` Returns a String representation of this EventObject.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### PreferenceChangeEvent

    public PreferenceChangeEvent (Preferences node,
                    String key,
                    String newValue)

Constructs a new `PreferenceChangeEvent` instance.

Parameters
`node` | `Preferences`: The Preferences node that emitted the event.
`key` | `String`: The key of the preference that was changed.
`newValue` | `String`: The new value of the preference, or `null` if the preference is being removed.

## Public methods

### getKey

    public String getKey ()

Returns the key of the preference that was changed.

Returns
`String` | The key of the preference that was changed.

### getNewValue

    public String getNewValue ()

Returns the new value for the preference.

Returns
`String` | The new value for the preference, or `null` if the preference was removed.

### getNode

    public Preferences getNode ()

Returns the preference node that emitted the event.

Returns
`Preferences` | The preference node that emitted the event.

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